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DR Medhat MRCP

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Functional Residual Capacity (FRC) :<br />

- Is the volume of air that remains in the lungs during quite breathing.<br />

- ( FRC = ERV + RV)<br />

Total Lung Capacity (TLC) :<br />

- Is the volume the whole respiratory system can accommodate.<br />

- (TLC= IRV + TV + ERV + RV)<br />

Lung capacities in healthy adults<br />

Volume<br />

Average value (litres)<br />

In men In women<br />

Derivation<br />

Vital capacity 4.8 3.1 IRV plus TV plus ERV<br />

Inspiratory capacity 3.8 2.4 IRV plus TV<br />

Functional residual capacity 2.2 1.8 ERV plus RV<br />

Total lung capacity 6.0 4.2 IRV plus TV plus ERV plus RV

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